It looks perfect solution, right? But actually they encountered a problem a pit father - white side! and，Wider than the width of the browser so a crack!

Ok，I div removed - too，Now no more than the width，But all around! Yes! White! side! La!

After viewing the page elements to find such a ghost ...... Well，As an amateur front end，I expressed this problem has troubled me for half an hour?

Css appear inexplicable

User agent style

The user agent style in the end is what? Obviously I did not write ah!

Various HTML tags：h1-h6,p,the,ol,dl "Even without them define style property values，They displayed in a browser，Property also has a variety of styles(Mainly a variety of font sizes and spacing)。This is because browsers these tags and CSS to set the default style property values。